PNG Features

PNG has the capability for both binary transparency (like GIF) and variable transparency, more commonly referred to as alpha transparency or translucency. Stored as RGBA (Red, Green, Blue, Alpha), each pixel is assigned one extra byte of data (or palette entry for 8-bit images) that defines its transparency level from 0 (fully transparent) to 255 (fully opaque). What does all this mean? For one thing, anti-aliased images will look good on any background. Imagine, no more ugly image halos or fringing! You can even apply background-independent effects such as drop-shadows and glows.